M75310

M75310 MOSDESIGN | Alldatasheet

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PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT SMOKE DETECTOR M75310 一華半導體股份有限公司 MOSDESIGN SEMICONDUCTOR CORP. GENERAL DESCRIPTION The M75310 is a very low-power IC providing all of the required features for a photoelectric type smoke detector. This device can be used in conjunction with an infrared photoelectric chamber to sense scattered light from smoke particles. A variable-gain photo amplifier can be directly interfaced to an infrared emitter / detector pair. The amplifier gain levels are Determined by two external capacitors that are then internally selected depending on the operating mode. Low gain is selected during standby and timer modes. During a local alarm this low gain is increased (internally) by ~ 10% to reduce false triggering. High gain is used during the push-button test and during standby to periodically monitor the chamber sensitivity.

FEATURES

‧ Interconnect up to 50 detectors. ‧ Piezoelectric horn driver. ‧ Power-on reset. ‧ Built-in circuits to reduce false triggering. ‧ 6V to 12V operating voltage range. ‧ Average Supply Current：8μA ‧ ESD-Protection circuitry on all pins. ‧ Temporal horn pattern.

APPLICATIONS

‧ Smoke detector. PIN ASSIGNMENT DETECT STROBE VDD IRED I/O TEST HORN2 LED HORN1 VSS OSCR TRIP FEEDBACK OSCC 11 6 M75310P

PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT SMOKE DETECTOR M75310 一華半導體股份有限公司 MOSDESIGN SEMICONDUCTOR CORP. PIN AND CIRCUIT DESCRIPTION Pin No Pin Name Description 1C 1 A capacitor connected to this pin determines the gain of the photo amplifier during the push-to-test mode and during the chamber monitor test. A typical value for this high-gain mode is 0.047μF but should be selected based on the photo chamber background reflections reaching the detector and the desired level of sensitivity. Ae ≒ 1 + ( C1 / 10 ) where C1 is in pF. Ae should not exceed 10,000. 2C 2 A capacitor connected to this pin determines the gain of the photo amplifier during standby. A typical value for this low-gain mode is 4700 pF but should be selected based on a specific photo chamber and the desired level of sensitivity to smoke. Ae ≒ 1 + ( C2 / 10 ) where C2 is in pF. Ae should not exceed 10,000. 3 DETECT This is the input to the photo amplifier and is connected to the cathode of the photo diode. The photo diode is operated at zero bias and should have low dark leakage current and low capacitance. 4S T R O B E This output provides a strobed, regulated voltage of VDD-5V . The minus side of all internal and external photo amplifier circuitry is referenced to this pin. 5 VDD This pin is connected to the most-positive supply potential. 6I R E D This output provides a pulsed base current for the external NPN transistor, which drives the IR emitter. Its beta should be greater than 100. The IRED output is not active, to minimize noise impact, when the horn and visible LED outputs are active. 7I / O A connection at this pin allows multiple smoke detectors to be interconnected. If a local smoke condition occurs, this pin is driven high. As an input, this pin is sampled nominally every 1.35 seconds during standby. Any local-alarm condition causes this pin to be ignored as an input. An internal NMOS device acts as a charge dump to aid in applications involving a large (distributed) capacitance. The charge dump is activated at the end of local or test alarm. This pin also has an on-chip pull- down resistor and must be left unconnected if not used. In application, there is a series current-limiting resistor to other smoke alarms.

8 HORN1

9 HORN2

10 FEEDBACK

These three pins are used in conjunction with external passive components and a self-resonating piezoelectric transducer. HORN1 is connected to the piezo metal support electrode; the complementary output, HORN2, is connected to the ceramic electrode and the FEEDBACK input to the feedback electrode. A continuous modulated tone indicates either a local or remote alarm condition. A short (10ms) chirp indicates a low-battery chirp occurs almost simultaneous with the visible LED flash. If the FEEDBACK pin is not used, it must be connected to VDD or VSS.

11 LED

This open-drain NMOS output is used to directly drive a visible LED. The low-battery test does not occur coincident with any other test or alarm signal. The LED also indicates detector status as follows (with component values as in the typical application , all times nominal)： Standby ─ Pulses every 43 seconds. Local Smoke ─ Pulses every 0.67 seconds. Remote Alarm ─ N o p u l s e s . Test Mode ─ Pulses every 0.67 seconds.

12 OSCC

A capacitor between this pin and VDD, along with a parallel resistor, forms part of a two-terminal oscillator and sets the internal clock low time. With component values as shown, this nominal time is 11 ms and essentially the oscillator period. 13 OSCR A resistor between this pin and OSCC (pin 12) is part of the two-terminal oscillator and sets the internal clock high time, which is also the IRED pulse width. With component values as shown , this nominal time is 105μs . 14 VSS This pin is connected to the most negative supply potential (usually ground).

15 TRIP

This pin is connected to an external voltage, which determines the low-supply alarm threshold. The trip voltage is obtained through a resistor divider connected between the VDD and LED pins. The low-supply alarm threshold voltage ( in volts ) ≒ ( 5R15/R14 ) + 5 where R15 and R14 are in the same units.

16 TEST

This pin has an internal pull-down device and is used to manually invoke a test mode. The Push-to-Test Mode is initiated by a high logic level on this pin (usually the depression of a normally open push-button switch to VDD). After one oscillator cycle, IRED pulse every 336 ms (nominal) and amplifier gain is increased by internal selection of C1. Background reflections in the smoke chamber can be used to simulate a smoke condition. After the third IRED pulse, a successful test (three consecutive simulated smoke conditions) activates the horn drivers and the I/O pin. When the push-button is released, the input returns to VSS due to the internal pull down. After one oscillator cycle, the amplifier gain returns to normal and after three additional IRED pulse (less than one second), the device exits this mode and returns to standby.

PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT SMOKE DETECTOR M75310 一華半導體股份有限公司 MOSDESIGN SEMICONDUCTOR CORP. FUNCTIONAL BLOCK DIAGRAM LOCAL ALARM TIMING DIAGRAM ( NOT TO SCALE )： 90% 10% tw(ired) 10% tf(ired) tired4 tired6 tw(st) tst4 tst6 tw(led) tled1 (NO PULSES) tled6 (AS OUTPUT) (AS INPUT) (AS OUTPUT) ton (horn)ton(horn) toff(horn) tr(io) toff(horn) NO SMOKE REMOTE SMOKE

3 STROBE WITH SMOKE

3 STROBE WITHOUT SMOKE

(PIN 6) STROBE (PIN 4) LED (PIN 11) I/O (PIN 7) ( NO LOCAL SMOKE ) HORN ENABLE LOCAL SMOKE (REMOTE SMOKE = DON’T CARE) LOGIC BAND-GAP REFERENCE OSCILLATOR & TIMING POWER-ON RESET LOW BATTERY PHOTO AMP VDD VDD DETECT I/O FEEDBACK STROBE IRED VSS HORN 2VDD LED HORN 1 OSCC OSCR TEST TRIP

PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT SMOKE DETECTOR M75310 一華半導體股份有限公司 MOSDESIGN SEMICONDUCTOR CORP. STANDBY TIMING DIAGRAM ( NOT TO SCALE )： tOSC tw(st) tled tst tW(led) CHIRP thorn tw(horn) LOW SUPPLY OR DEGRADED SENSITIVITY WARNNING CHIRPS ARE OFFSET NO LOW SUPPLY CHAMBER SENSITIVITY NORMAL OSCC (PIN 12) INTERNAL CLOCK IRED (PIN 6) STROBE (PIN4) LED (PIN 11) SAMPLE SMOKE HORN ENABLE tired tW(ired) WARNING

PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT SMOKE DETECTOR M75310 一華半導體股份有限公司 MOSDESIGN SEMICONDUCTOR CORP. ABSOLUTE MAXIMUM RATING Parameter Sym. Rating Unit Supply V oltage Range VDD -0.5 ~ 13 V Input V oltage Range VIN -0.3 to VDD + 0.3 V Input Current IIN 10 mA Operating Temperature Range TA -25 ~ 75 ℃ Storage Temperature Range TS -55 to 125 ℃ DC ELECTRICAL CHARACTERISTICS (TA=-25℃ ~ 75 ℃) Characteristics Sym. Pin V DD Min. Typ. Max. Unit Conditions Supply V oltage V DD — 6.0 — 12 V 12 —— 8 μA Average Standby 12 —— 2.0 mA During Strobe ON, I RED OFFOperating Supply Current I DD 12 —— 3.0 mA During Strobe ON, I RED ON 79 —— 1.5 V 10 9 —— 2.7 V 16 9 —— 7.0 VLow-Level Input V oltage V IL 15 9 —— 0.5 V 79 3 . 2 —— V 10 9 6.3 —— V 16 9 8.5 —— VHigh-Level Input V oltage V IH 15 9 1.6 —— V 12 12 —— 100 nA V IN=VDD, Strobe Active, Pin12 @VDD Input Leakage High I IH 15 12 —— 100 nA V IN=VDD 12 12 —— -100 nA VIN=VST , Strobe Active, Pin12 @VDD 15 12 —— -100 nAInput Leakage Low I IL 16 12 —— -1.0 μA VIN=VSS 16 9 0.5 — 10 μA VIN=VDD (@V DD =9V) 79 2 0 — 80 μA No Local Smoke ,VIN= VDD (@VDD=9V)Input Pull-Down Current I IN 71 2 —— 140 μA No Local 11 6.5 —— 0.6 V I O = 10mALow-Level Output V oltage V OL 8, 9 6.5 —— 1.0 V I O = 16mA High-Level Output V oltage V OH 8, 9 6.5 5.5 —— VI O = -16mA 12 V DD-0.1 —— V Inactive , IO = -1μAStrobe Output V oltage V ST 4 9V DD-5.6 — VDD-4.4 V Active , IO = 100μA to 500μA Line Regulation ΔVST(ΔVDD) —— -60 — dB Active, VDD= 6V to 12V 12 —— 0.1 V Inactive , IO =1Μa , TA = +25℃IRED Output V oltage V IRED 6 9 2.25 3.0 3.75 V Active , IO = -6mA , TA = +25℃ Line Regulation ΔVIRED(ΔVDD) —— -35 — dB Active, VDD= 6V to 12V High-Level Output V oltage IOH 79 - 4 . 0 —— mA V DD= Alarm, I/O active, VO= VDD-2V OFF Leakage Current High I OZ 11 12 —— 1.0 μA VO= VDD OFF Leakage Current Low I OZ 11 12 —— -1.0 μA VO= VSS Low VDD Alarm Threshold VDD (th) — 6.5 7.2 7.8 V Common Mode V oltage V IC 1, 2, 3 — VDD-4 — VDD-2 V Any Alarm Condition

PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT SMOKE DETECTOR M75310 一華半導體股份有限公司 MOSDESIGN SEMICONDUCTOR CORP. * Limits over the operating temperature range are based on characterization data. Characteristics are production tested at +25℃. Typical values are at +25 ℃and are given for circuit design information only. AC ELECTRICAL CHARACTERISTICS (TA=-25℃ ~ 75 ℃) Characteristics Sym. V DD Min. Typ. Max. Unit Conditions Oscillator Period T OSC 9 9.5 10.5 11.5 ms TLED1 9 38.9 43 47.1 s No Local or Remote Smoke TLED2 9N o n e —— s Remote Smoke onlyLed Pulse Period TLED3 9 0.6 0.67 0.74 s Local Smoke or Test Led Pulse Width TW (LED) 99 . 5 — 11.5 ms TST1 99 . 6 7 — 11.83 s No Local or Remote Smoke TST4 9 9.67 10.7 11.83 s Remote Alarm TST5 93 8 . 9 — 47.1 s Chamber Test or Low Supply Test, No Local AlarmStrobe Pulse Period TST6 9 0.302 1 0.37 s Pushbutton Test, No Alarm Strobe Pulse Width T W (ST) 99 . 5 — 11.5 ms Remote Alarm TIRED1 99 . 6 7 — 11.83 s No Local or Remote Smoke TIRED4 9 9.67 10.7 11.83 s No Local or Remote Smoke TIRED5 93 8 . 9 — 47.1 s Chamber Test, No Local AlarmIRED Pulse Period TIRED6 9 0.302 0.336 0.37 s Pushbutton Test, No Alarm IRED Pulse Width T W (IRED) 99 4 — 116 μs IRED Rise Time Tr(IRED) —— 30 μs 10% to 90% IRED Fall Time Tf (IRED) —— 200 μs 90% to 10% Horn Warning Pulse Period THORN 93 8 . 9 — 47.1 s Low Supply and Degraded Chamber Sensitivity Horn Warning Pulse Width T W (HORN) 99 . 5 — 11.5 ms Low Supply and Degraded Chamber Sensitivity Horn ON Time T ON (HORN) 9 120 160 208 ms Local or Remote Alarm Horn OFF Time T OFF (HORN) 9 32 80 104 ms Local or Remote Alarm * Limits over the operating temperature range are based on characterization data. Characteristics are production tested at +25℃. Typical values are at +25 ℃and are given for circuit design information only.

PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT SMOKE DETECTOR M75310 一華半導體股份有限公司 MOSDESIGN SEMICONDUCTOR CORP. APPLICATION DIAGRAM (一) STAND-ALONE： 1. Value for R11、R12 and C6 may differ depending on type of piezoelectric horn used. 2. C2 and R7 are used for coarse sensitivity adjustment. Typical values are shown. 3. C4 should be 22 μF if B1 is a carbon battery. C4 could be reduced to 1μF when an alkaline battery is used. C1 0.047μF R1 5.6KΩ C2 4700pF R2 5KΩ C3 100μF R3 8.2KΩ C4 22μF R4 1KΩ C5 1500pF R5 560Ω C6 1000pF R6 200KΩ R7 4.7Ω~22Ω R8 330Ω R9 10MΩ R10 100KΩ R11 200KΩ R12 2MΩ R13 220Ω R14 100KΩ R15 33KΩ M75310P 11 6 VDD VDD R11 STROBE DETECTR3 R10 R12 TRIP TEST TO/FROM UNITS OTHER R13 I/O IRED HORN1 OSCR VSS LED OSCC HORN2 FEEDBACKC3 TEST TO PUSH R14 R15

PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT SMOKE DETECTOR M75310 一華半導體股份有限公司 MOSDESIGN SEMICONDUCTOR CORP. (二) NETWORK： 1. C2 and R7 are used for coarse sensitivity adjustment. Typical values are shown. 2. C4 should be 22 μF if B1 is a carbon battery. C4 could be reduced to 1μF when an alkaline battery is used. 3. FEEDBACK (PIN10) 、TRIP (PIN15) and TEST (PIN16) must connect to ground. * All specs and applications shown above subject to change without prior notice. (以上電路及規格僅供參考,本公司得逕行修正) C1 0.047μF R1 5.6KΩ C2 4700pF R2 5KΩ C3 100μF R3 8.2KΩ C4 22μF R4 1KΩ C5 1500pF R5 560Ω R6 200KΩ R7 4.7Ω~22Ω R8 10MΩ R9 100KΩ R10 220Ω M75310P 11 6 VDD VDD STROBE DETECTR3 TRIP TEST TO/FROM UNITS OTHER R10 I/O IRED HORN1 OSCR VSS LED OSCC HORN2 FEEDBACKC3